/* Copyright (C) 2004 - 2006  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
namespace Db4objects.Db4o.Foundation.Network
{
	/// <summary>Fakes a socket connection for an embedded client.</summary>
	/// <remarks>Fakes a socket connection for an embedded client.</remarks>
	public class LoopbackSocket : Db4objects.Db4o.Foundation.Network.ISocket4
	{
		private readonly Db4objects.Db4o.Foundation.Network.ILoopbackSocketServer _server;

		private Db4objects.Db4o.Foundation.Network.LoopbackSocket _affiliate;

		private Db4objects.Db4o.Foundation.Network.ByteBuffer4 _uploadBuffer;

		private Db4objects.Db4o.Foundation.Network.ByteBuffer4 _downloadBuffer;

		public LoopbackSocket(Db4objects.Db4o.Foundation.Network.ILoopbackSocketServer a_server
			, int timeout)
		{
			_server = a_server;
			_uploadBuffer = new Db4objects.Db4o.Foundation.Network.ByteBuffer4(timeout);
			_downloadBuffer = new Db4objects.Db4o.Foundation.Network.ByteBuffer4(timeout);
		}

		public LoopbackSocket(Db4objects.Db4o.Foundation.Network.ILoopbackSocketServer a_server
			, int timeout, Db4objects.Db4o.Foundation.Network.LoopbackSocket affiliate) : this
			(a_server, timeout)
		{
			_affiliate = affiliate;
			affiliate._affiliate = this;
			_downloadBuffer = affiliate._uploadBuffer;
			_uploadBuffer = affiliate._downloadBuffer;
		}

		public virtual void Close()
		{
			CloseAffiliate();
			CloseSocket();
		}

		private void CloseAffiliate()
		{
			if (_affiliate != null)
			{
				Db4objects.Db4o.Foundation.Network.LoopbackSocket temp = _affiliate;
				_affiliate = null;
				temp.Close();
			}
		}

		private void CloseSocket()
		{
			_downloadBuffer.Close();
			_uploadBuffer.Close();
		}

		public virtual void Flush()
		{
		}

		public virtual bool IsConnected()
		{
			return _affiliate != null;
		}

		public virtual int Read()
		{
			return _downloadBuffer.Read();
		}

		public virtual int Read(byte[] a_bytes, int a_offset, int a_length)
		{
			return _downloadBuffer.Read(a_bytes, a_offset, a_length);
		}

		public virtual void SetSoTimeout(int a_timeout)
		{
			_uploadBuffer.SetTimeout(a_timeout);
			_downloadBuffer.SetTimeout(a_timeout);
		}

		public virtual void Write(byte[] bytes)
		{
			_uploadBuffer.Write(bytes);
		}

		public virtual void Write(byte[] bytes, int off, int len)
		{
			_uploadBuffer.Write(bytes, off, len);
		}

		public virtual void Write(int i)
		{
			_uploadBuffer.Write(i);
		}

		public virtual Db4objects.Db4o.Foundation.Network.ISocket4 OpenParalellSocket()
		{
			return _server.OpenClientSocket();
		}
	}
}
